JPS5816768Y2 - safety belt retractor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a safety belt retractor.

An emergency lock type retractor used for the safety belts of vehicles, etc., prevents the safety belt from being pulled out in the event of an emergency such as a vehicle collision, rollover, or sudden stop. A winding device that utilizes rotational inertia is generally used, but in such a winding device, the drawer sensing performance is improved, for example, 0
．． If high-performance technology such as 3G sensing is used, when a passenger suddenly pulls out the safety belt while trying to put on the safety belt,
There was an inconvenience that the inertia mechanism was activated and the belt was locked and could not be pulled out.

In addition, in a winding device that locks the belt by sensing the acceleration/deceleration of a vehicle, etc., providing a sensing mechanism in the winding device itself provides a wide range of sensing performance, for example from 0.3G to 1.OG. However, the volume of the winding device became large and there was a problem in arranging the winding device inside the vehicle.

Furthermore, if such a sensing mechanism is installed in a location other than the winding device, a large number of electrical wirings will be required inside the vehicle, and the winding device will have to be operated electrically, which has the disadvantage that the winding device cannot be used depending on the vehicle type.

Furthermore, in many of the conventional devices described above, locking is performed by engaging a pawl also made of iron with a ratchet wheel made of iron that is fixedly attached to the belt take-up reel. This also has the drawback of increasing weight, which limits the ability to make the device smaller and lighter.

The present invention was made in order to eliminate the above-mentioned drawbacks, and includes a sensing mechanism that senses acceleration in a high-performance band in the range of 0.3G to 0.7G, and a sensing mechanism that senses acceleration of 0.70 or more. Although it is a so-called double safety system that locks the belt drawer for each, it has a simple structure and a small number of parts, making the device smaller, lighter, and lower in price. The object of the present invention is to provide a safety belt retractor that can take up a safety belt.

The present invention will be specifically explained below using examples.

Fig. 1 is an exploded perspective view showing one embodiment of the device of the present invention;
The figure is an assembled cross-sectional view.

Reference numeral 1 denotes a U-shaped frame, which is attached to the vehicle floor, seat, etc. by appropriate means.

Through holes 1a and 1b are provided approximately at the center of both side plates IA and IB of this U-shaped frame 1, and a belt winding hole is inserted into the through holes through collar members 2A and 2B, respectively. A shaft 4 to which a roll 3 is fixed is rotatably supported.

A spring cover 1 housing a return spring 6 is attached to the outside of one side plate 1B of the frame 1 via a retainer 5 by screws or the like.

The return spring 6 is fixed between one end of the shaft 3 and the spring cover 7, and the spring 6 causes the belt take-up reel 3 and the shaft 4 to move in the direction of arrow A (clockwise) shown by the solid line in the figure. A safety belt 8 having one end fixed to the liquid is wound around this reel.

Therefore, when the safety belt 8 is pulled out, this reel 3
And the shaft 4 rotates in the direction of arrow B (counterclockwise) shown by the broken line in the figure.

Further, on the outer surface of one side plate 1A of the U-shaped frame 1, a plurality of (12 in the figure) locking portions 9 are formed at regular intervals on the outer peripheral surface of the through hole 1a. .

This locking portion 9 consists of substantially fan-shaped grooves or holes (grooves are shown in the figure), and one inner side of each groove may be rotated counterclockwise (arrow B in the figure) as shown in FIG. ) is formed with a taper 9A that slopes downwardly.

The tip of the shaft 4 protrudes outward from one side plate 1A, and a disc-shaped flange 10 having a notch 10A at the periphery is fixed to the base end of the protrusion.

A plurality of these notches 10A (six in the figure) are provided at positions corresponding to the grooves 9 provided in the side plate 1A.

A substantially disc-shaped latch member 12 is freely supported on the shaft 4 through a first spring 11 on the outside of this flange 10, and this latch member 12 is provided on the outside thereof.
By engaging with the first locking protrusion 13A of the locking member 13 press-fitted into the shaft 4, outward movement is inhibited.

The latch member 12 has the same number of protrusions 12A as the notches 10A (for example, 6 protrusions) arranged around the periphery of the latch member 12 to correspond to the notches 10A of the flange 10 and constantly meshing with the notches 10A.
) are provided, and the tip 12 of each protrusion 12A is provided.
As shown in FIG. 4, a is tapered so as to have a wide angle in the counterclockwise direction (arrow B in the figure), and both side surfaces 12b are tapered in the clockwise direction (arrow A in the figure). A taper is formed.

This latch member 12 is normally urged by the first spring 11 to a position in contact with the locking protrusion 13A, but when pushed by the action of a cam member to be described later, it moves inward. The thrust moves so that the tip of the protruding portion engages with the locking portion 9 of the side plate.

In this case, since the locking portion 9 and the protruding portion 12A are each formed with a taper having a relative inclination, a secure engagement is achieved and rotation in the belt winding direction (clockwise) is prevented. There's nothing to do.

Further, a plurality (for example, six) of first cam recesses 12B are provided on the plate surface of the latch member 12 at regular intervals on the circumference.

This first cam portion 12B is, for example, a substantially fan-shaped part,
are formed at equal intervals at corresponding positions between the respective protrusions,
The counterclockwise inner surface of each company forms a taper that becomes wider toward the outside.

Here, the latch member 12 has a protrusion 12A that is always engaged with the notch 10A of the flange 10, so that the shaft 4 rotates in accordance with the pulling out and winding operations of the belt 8.
It is designed to rotate with the

Outside the latch member 12, an inertia wheel 14 is movably supported on the first locking protrusion 13A of the locking member press-fitted into the shaft 4 so as to be movable in the thrust direction. is installed.

This inertia wheel 14 has a generally cup shape as a whole, and a hole 14E is formed in the center of the side plate.

A plurality of (12 teeth in the figure) first ratchet teeth 14 are provided on the outer peripheral surface at appropriate intervals in the counterclockwise direction.
A is formed on the outer side of the hole 14E, and a plurality of teeth (12 teeth in the figure) facing in the same direction as the first ratchet teeth 14A are formed.
A second ratchet tooth 14B is provided on the outer periphery of the second ratchet tooth 14B, and a plurality (12 in the figure) of third ratchet teeth 14D facing in the opposite direction to the second ratchet tooth 14B are provided. It is being

Here, to explain an example of the arrangement of the first to third ratchet teeth, the second ratchet teeth 14B are located at a position corresponding to approximately the middle of each tooth of the first ratchet teeth 14A, and the third ratchet teeth The teeth 14D are provided at positions corresponding to substantially intermediate portions of the respective teeth of the second ratchet teeth 14B.

The second ratchet tooth 14B is located on the frame side plate 1A.
The same number (1
2 sheets) are provided.

Furthermore, a second cam protrusion 14C is provided around the hole 14E on the inner surface of the inertia wheel 14.

Specifically, the second cam convex portion 14C is a mountain-shaped protrusion arranged to correspond to the first cam concave portion 12B provided in the latch member 12, as shown in FIG. 5, for example. One side portion 14C1 of each protrusion is tapered downward in a direction opposite to the direction of rotation of the latch member 12 when the belt is pulled out (direction of arrow B in the figure), and the tip portion 14C2 is a flat portion. It is processed to form the following.

In such an inertia wheel 14, normally, the protrusion 14C, which is the second cam protrusion, is fully inserted into the hole 12B, which is the first cam concave part, of the latch member 12, and its base is flush with the plate surface of the latch member 12. The second spring 1 is in contact with
5.

This second spring 15 is connected to the second spring 15 of the locking member 13.
It is fixed between the locking protrusion 13B and the inertia wheel 14.

Therefore, the rotation of this inertial wheel 14 causes the latch member 12 to
If the latch member 12 is later than that, first, the latch member 12 will slide on the tapered surface 14C1 of the cam projection 14C of the inertia wheel 14 in the fan-shaped hole 12B, and one of them will move along the axial direction. .

Therefore, the spring 11 (
If the elasticity of the first spring) is made stronger than that of the spiral spring 15 (second spring) that urges the inertia wheel 14, the inertia wheel 14 can be moved as shown in FIG. It will move to the right (outward) (in the direction of arrow C in the figure).

Reference numeral 16 designates a cup-shaped cover attached to the side plate surface of the frame 1 by screws or the like so as to cover each of the above-mentioned members. First mating protrusion 16A that can be mated
A plurality of (three in the figure) are provided at equal intervals, and a third ratchet tooth 14D that can mesh with the third ratchet tooth 14D is provided on the outer peripheral surface of the first meshing projection 16A at a position slightly apart from the first meshing projection 16A. A plurality of meshing protrusions 16B (three in the figure) are arranged at equal intervals.
It is provided.

As described above, when the inertia wheel 14 moves outward due to the action of the first cam recess and the second cam projection, the first meshing protrusion 16A engages with the second ratchet tooth 14B. The two mesh with each other, and the rotation of the inertial wheel 14 is stopped 9.

Therefore, when the rotation of the inertia wheel 14 is stopped due to the engagement between the second ratchet teeth 1.4B and the first engagement protrusion 16A, the latch member 12 is moved as shown in FIG. It will move to the left (inward) (in the direction of the arrow).

An inertial sensing device 17 (
(hereinafter referred to as a sensor) is housed and held.

The sensor 17 has a bottom plate 17B with a dish-shaped protrusion 17A formed approximately in the center, and is normally placed on the plate of the protrusion 17A, and can be moved to the peripheral side of the plate when in operation. The installed sphere 17C, the box-shaped case 17D which is arranged so as to cover them and has an opening at one end, and the pin 17
It is swingably attached to the case 17D via the spherical body 17C, and has a position where the distal end claw engages with the first ratchet tooth 14A of the inertia wheel 14 and a position where it does not engage, depending on the movement of the sphere 17C. and an engaging piece 17F that is movably arranged.

This processor 17 is used for example when the vehicle suddenly stops or slopes.
．． The relationship between each member is set so that it will be used when an acceleration of about 3G to 07G is applied, and other members such as the weight of the inertia wheel 14 and the first and second springs 11 and 15 are For example, the relationship is 0, such as a vehicle collision, etc.
．． The value is set so that when an acceleration of 7 G or more is rapidly applied, the inertia wheel 14 is pushed outward and collides with the inner surface of the cover 16.

Incidentally, among the above-mentioned members, at least the frame 1. Reel 3, shaft 4. Flange 10. Although the latch member 12 is preferably made of a material with high strength, such as iron, the other members may be made of lightweight and inexpensive materials, such as synthetic resin.

Next, before explaining the overall operation, the arrangement relationship and general operation of the main parts will be explained with reference to FIGS. 6 to 8.

First, during normal belt drawing and winding operations, as shown in FIG. 6, the second cam protrusion 14C of the inertia wheel 14 is deeply inserted into the first cam recess 12B of the latch member 12. The inertia wheel 14 and the latch member 12 are located close to each other.

At this time, the protrusion 12A of the latch member 12 is attached to the flange 1.
0, but is not engaged in the locking part 9 of the frame side plate 1A.

Further, the inertia wheel 14 and the cover 16 are located apart from each other, and the second and third ratchet teeth 14B, 14D and the first
and the second meshing protrusions 16A, 16B are arranged at positions where they do not mesh with each other.

Next, at the time of emergency locking, as shown in FIG. 7, the inertia wheel 14 is first pushed outward (arrow C in the figure) and comes into contact with the cover 16, and the second ratchet tooth 14B engages the first tooth of the cover. The second cam protrusion 14C is used to push the latch member 12 inward (arrow D in the figure) to lock the protrusion 12A of the latch member 12 to the frame side plate 1A. 9.

At this time, the rotation of the inertia wheel 14 has stopped, but
The protrusion 12A of the latch member 12 is connected to the frame side plate 1A.
If the flange 10 has not completely engaged with the locking portion 9 of the flange 10, the flange 10 continues to rotate, causing the latch member 12 to rotate.

At this time, the inertia wheel 14 is inserted into the first cam recess of the latch member.
Forcibly pushes the second cam convex part of the inertia wheel 14 toward the cover 16, and as a result
There is a risk that the cam convex portion 14C, the ratchet teeth 14B, the meshing protrusion 16A, etc. may be damaged.

Therefore, in the present invention, the above-mentioned problem is solved by making it possible for the tip end 14C2 of the second cam convex part 14C of the inertial wheel 14 to ride on the side surface of the second cam four part 12B of the latch member 12.

That is, the distance from the inner surface of the cover 16 to the bottom of the locking part 9 of the frame side plate 1A in FIG. Tip portion 1 of second cam convex portion 14C of wheel 14
The distance is set to be equal to the distance at which the ratchet teeth 14B of the inertia wheel 14 come into contact with the inner surface of the cover 16 when the latch 4C2 rides on the side surface of the latch member 12.

The relationship between the two ratchet teeth 14B, 14D provided on the outer surface of the inertia wheel 14 and the first and second meshing protrusions 16A, 16B provided on the inner surface of the cover 16 is shown in FIG. 8a. It is as shown in b.

That is, at the time of emergency locking, the cover 1 is closed as shown in Figure a.
The second engaging projection 16A of the inertia wheel 14 is connected to the first engaging protrusion 16A of the
The rotation of the inertia wheel 14 in the B direction (bell alignment direction) is stopped by the engagement of the ratchet teeth 14B of the flange 10. The inertia wheel 1 is rotated in conjunction with the rotation of the latch member 12.
4 also rotates in the backward direction (belt winding direction).

However, as described above, since the second cam convex portion 14C of the inertial wheel 14 rides on the side surface of the latch member 12 when the lock is locked, an inconvenience arises in that it cannot return to its original position.

Therefore, in the present invention, as shown in Fig. 8, the inertia wheel 1 is
4 is provided with a third ratchet tooth 14D, and the cover 16 is provided with a second meshing protrusion 16B so that the two mesh with each other to stop the rotation of the inertia wheel in the belt winding direction (in the direction shown in the figure). did.

As a result, immediately after the lock is released, only the flange 10 and the latch member 12 rotate in the backward direction, and the second cam convex portion 1.4C of the inertia wheel 14
, and the arrangement of each member is returned to its initial state.

Therefore, in order to perform the above-mentioned operation smoothly, the first and second engaging protrusions 16A and 16B provided on the cover 16 should be arranged so as to have a slight interval 1 as shown in FIG. is preferred.

Next, the overall operation of the device of the present invention will be explained with reference to FIG.

When the safety belt 8 is in a normal state and pulled out at a normal speed, the reel 3. Shaft 4, flange 10. Latch member 12. The inertia wheel 13 rotates at the same time as the shaft 4, and at this time the latch member 12 is not pushed by the cam protrusion 14C of the inertia wheel 14, so it does not move. It will not be engaged with the locking part 9 of.

In this way, the safety belt 8 is elastically pulled out and retracted in accordance with the movements of the occupant.

Next, as shown in FIG. 9, when an acceleration of, for example, 0.3G to 0.708 degrees is applied due to a sudden stop or inclination of the vehicle, the rolling of the ball 17C of the sensor 17 causes the engagement piece 17F to
moves as a-+b-+c and meshes with one of the first ratchet teeth 14A of the inertia wheel 14.

At this time, acceleration is applied to the passenger and the belt 8 is about to be pulled out, causing the shaft 4 and the flange 1 fixed to the shaft to be pulled out.
0 and latch member 12 will rotate, or inertia wheel 14 will not rotate.

At this time, since the elasticity of the first spring 11 is set to be stronger than that of the second spring 15, the first cam recess 12 of the latch member 12 is
B and the second cam convex portion 14C of the inertia wheel 14 first pushes the inertia wheel 14 outward to contact the inner surface of the cover 16, thereby causing the second ratchet tooth 14 to contact the inner surface of the cover 16.
B is engaged with the first engagement projection 16A, and outward movement of the inertial wheel 14 is prevented.

In this case, since the second and third ratchet teeth are provided at the same spacing and in the same number, their meshing is performed reliably and smoothly.

Then, when the movement of the inertia wheel 14 in the thrust direction is blocked, the cam portion 14C of the inertia wheel 14 pushes the cam portion 12B of the latch member 12, and as a result, the latch member 12 is affected by the force of the spring 11. It is pushed to the left as shown in the figure.

As a result, the protruding portion 12A of the latch member 12 engages with the locking portion 9 of the frame 1, and the withdrawal of the belt 8 is locked.

In this case, the protruding portion 12A of the latch member 12 and the locking portion 9 of the frame 1 that receives the protruding portion 12A are provided with corresponding tapers, and the respective members are arranged in correspondence, so that
The engagement will be performed smoothly and reliably.

Further, since the second cam convex portion 14C of the inertia wheel 14 rides on the side surface of the latch member 12, there is no fear that each member will be damaged.

Next, if an acceleration of 0.7 G or more is rapidly applied due to a vehicle collision or the like, the inertial wheel 14 will lag behind the rotation of the shaft 4.

In this case as well, as described above, the cam recess 1 of the latch member 12
2B and the cam protrusion 14C of the inertia wheel 14, the inertia wheel 14 is first moved outward, and the ratchet teeth 14B engage with the first engagement protrusion 16A of the cover 16 to prevent rotation. be done.

Thereafter, the withdrawal of the belt 8 is finally locked by the same action as in the case described above.

(Figure 10 shows the arrangement of each member when locked).

In this way, the belt drawer is reliably locked even in the case of incomplete activation of the sensitive sensor.

In any case, if the posture of the vehicle or the occupant returns to its original state, the sensor returns to its original state, and the latch member 12 and inertia wheel 14- return to their original positions due to the elasticity of the springs 11 and 15. The belt will be unlocked.

At this time, as described above, in the initial state of unlocking, the rotation of the inertia wheel 14 in the belt winding direction is blocked by the engagement protrusion 16B of the cover 16, and the cam protrusion of the inertia wheel that has rested on the side surface of the latch member 12 Since 14C returns to its original state, each member returns smoothly and reliably to its initial state, and no malfunction occurs.

Further, in any case in the above operation, the number of locking portions 9 provided on the frame side plate 1A and the number of second ratchet teeth 14B formed on the side surface of the inertia wheel 14 are made the same and corresponding. Due to this arrangement, the protruding portion 12A of the latch member 12 and the locking portion 9 are engaged synchronously, so that the belt pulling-out operation can be quickly and reliably locked.

According to the device of the present invention described in detail above, when the occupant fastens the safety belt, the belt will not be locked even if the belt is pulled out quite suddenly, and in case of an emergency, the safety belt will be double-safe by detecting the vehicle body and detecting the belt being pulled out. This method allows the belt to be completely locked, and since it has an extremely simple structure and many of the components are made of synthetic resin, it can contribute to making the device smaller and lighter. becomes.

Moreover, the operation is reliable, quick and smooth.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing one embodiment of the device of the present invention;
The figure is an assembled sectional view, Figures 3 to 5 are explanatory diagrams showing an example of the configuration of each member used in it, and Figures 6 to 8 are
The figure is a schematic explanatory diagram for explaining the arrangement relationship of each member and its operation, FIG. 9 is a front view for explaining the operation of the inertial sensing device used in the device of the present invention, and FIG. 10 is the device of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... U-shaped frame, 3... Belt winding reel, 4... Shaft, 8... Safety belt, 9... Locking blind person 10... Flange, 10A... Cutting Komibe, 11
...first spring, 12...latch member, 12
A... Protrusion, 12B... First cam recess, 14.
...Inertia wheel, 14A...first ratchet tooth,
14B...Second ratchet tooth, 14D...Third ratchet tooth, 14C...Second cam protrusion, 15...
・Second spring, 16...Cover, 16A...
First interlocking projection, 16B...Second interlocking projection, 1
7...Inertial sensing device.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) One end of the belt is fixed to a belt take-up reel fixed to a shaft mounted between the side plates of a U-shaped frame,
In a belt winding device that pulls out a belt against the force of an elastic spring and stores it so that it can be rewound by the force of the spring,
A plurality of locking portions are arranged on one side plate of the frame at predetermined intervals on a circumference concentric with the shaft, and a plurality of locking portions are fixed on a shaft protruding from the side plate and spaced at predetermined intervals on the circumference. A flange having a plurality of notches formed by the flange, and a protrusion that constantly meshes with the notches of the flange and moves between a position in which it engages with the locking part and a position in which it does not engage are made of water. a latch member that is loosely supported by the shaft and has a plurality of first cam recesses arranged at predetermined intervals on the circumference; and a latch member that is inserted between the flange and the latch member. a first spring that urges the latch member to a position where the protruding part of the latch member does not engage with the locking part of the side plate;
The entire body is approximately cup-shaped, and the inner surface has a position that engages with the first cam recess, and slides within the first cam recess and rides on the surface to move the latch member in the thrust direction. It has a second cam convex portion that moves to and from the desired position, and has first ratchet teeth arranged at predetermined intervals on the outer circumferential surface, and further has first ratchet teeth on the outer surface that are the same as the first ratchet teeth. A second ratchet tooth having a direction opposite to that of the second ratchet tooth and a third ratchet tooth disposed at a position not corresponding to the second ratchet tooth are formed and movably supported on the shaft. an inertia wheel and first and second ratchet teeth that can mesh with the second and third ratchet teeth, respectively;
a second spring inserted between the inertia wheel and the cover and normally biased to a position where the inertia wheel does not come into contact with the cover; , an inertia sensing device having an engaging piece disposed below the inertia wheel and capable of meshing with the first ratchet tooth in response to acceleration/deceleration of the vehicle, and the device is configured to provide a mechanism for rapidly pulling out the belt when the vehicle suddenly decelerates. The cam portion of the latch member is pushed by the cam portion of the inertia wheel due to either a rotational delay due to the inertia of the inertia wheel itself due to the rotation of the rotating latch member, or control of the inertia wheel due to sensing by the inertia sensing device, resulting in a protruding portion. A safety belt winding device characterized in that the rotation of a belt winding reel is locked by engaging with a locking part. ≧) By making the number of the locking portions and the number of teeth of the second ratchet teeth the same, synchronization is achieved when the protruding portion of the latch member and the locking portion engage. A safety belt winding device according to claim 1 of the utility model registration claim. 3) The distance from the inner surface of the cover to the bottom of the locking part of the frame side plate is such that the tip of the protruding part of the latch member contacts the bottom of the locking part, and the tip of the second cam convex part of the inertia wheel is in contact with the latch. Claim 1 or claim 1, characterized in that the distance is set to be equal to the distance at which the second ratchet teeth of the inertia wheel come into contact with the inner surface of the cover when the inertia wheel rides on the side surface of the member. The safety belt retractor according to item 2. (4) Utility model registration claims 1 to 3, characterized in that the first and second engaging protrusions provided on the inner surface of the cover are arranged with a slight distance from each other. (5) The inertia sensing device includes an engagement piece that moves between a position in which it engages and a position in which it does not engage the first ratchet tooth of the inertia wheel; It consists of a sphere that rolls when accelerating and decelerating.
The safety belt winding device according to any one of claims 1 to 4 of the utility model registration claim, characterized in that the engaging piece is actuated by the transfer of the sphere.